紫花苜蓿的生长过程中产生一皂甙和刀豆氨酸(学科上称为自毒物质)。从紫花苜蓿的鲜叶、茎、花冠、残植株、腐根和种子中释放,产生持久的毒性,影响后续苜蓿的生长发育,造成草产量递减。本文就紫花苜蓿如何规避自毒物质对产草量和苜蓿寿命的影响进行了一些探讨,并提出一些解决办法. Medicago sativa produces a saponin and a concanavalin (disciplinarily known as self-toxic substances) during its growth. The release from fresh leaves, stems, corolla, residual plant, roots and seeds of alfalfa resulted in long-lasting toxicity, which affected the growth and development of subsequent alfalfa and resulted in the decrease of grass production. This paper discussed how alfalfa can avoid the impact of self-toxic substances on the yield of grass and the longevity of alfalfa and put forward some solutions.